I have had episodes of depression throughout my life, and still have them now that I'm sober, but they aren't nearly so overwhelming. I have a bit more perspective that this is only temporary and will pass.
What I didn't realize until I quit was just how anxious I am! I mean, doesn't everyone perceive every new person they meet as a potential enemy? Lol....but I am working on this as well. Learning to see my anxious thoughts as unreal as the dreams I have when I'm asleep.